Sep 18 – 24, 2022
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Free-electrons manipulation with light in an RF-cavity-based Ultrafast Transmission Electron Microscope

Sep 23, 2022, 5:10 PM
Sala Maria Luisa - Hotel Hermitage

Sala Maria Luisa - Hotel Hermitage

Invited talk Special Topic


Simona Borrelli (TU/Eindhoven)


Developing new methods for tailoring the phase-space distribution of electron beams is a challenging and essential task in next-generation particle accelerators, compact x-rays sources, and ultrafast electron microscopy. RF-cavities are routinely employed in accelerator science to manipulate the electrons’ phase-space. This contribution shows the use of a miniaturized RF-cavity to chop the continuous beam of a conventional transmission electron microscope into ultrashort pulses. We developed an RF-cavity-based ultrafast transmission electron microscope (UTEM) generating few-100-fs pulses with GHz-MHz repetition rate, which preserves the low emittance and energy spread of the TEM Schottky field emission gun.
Beyond time-resolved investigation of specimens, UTEMs entitle novel free-electron quantum optics. We devise techniques to control and shape the electron wavefunction amplitude and phase for coherent detection methods and distinct phase-contrast imaging. A laser oscillator is integrated into the RF-cavity-based UTEM setup, thus allowing the observation of the synchronized interaction between free-electrons and fs-laser pulses.
We propose to exploit this interaction to coherently shape the electron wavefunction in photon-induced near-field electron microscopy and light-based Zernike phase plate imaging. We present experimental results and a theoretical model of the ponderomotive interaction between free-electrons and laser pulses, which opens the path to the phase-manipulation of high-relativistic electron beams.

Primary authors

Simona Borrelli (TU/Eindhoven) Mr S. T. Kempers (TU/Eindhoven) Dr E. Kieft (ThermoFisher Scientific) Dr P.H.A. Mutsaers (TU/Eindhoven) Prof. K.A.H. van Leeuwen (TU/Eindhoven) Prof. O.J. Luiten (TU/Eindhoven)

Presentation materials